Vodafone Contract - iPhone ?

Okay I have a Samsung Tocco Ultra at the moment and i'm on a £35pm Vodafone contract with 600min unlimited texts and unlimited mobile internet - however I absolutely loathe the phone and I have an opportunity to buy a Vodafone iPhone in March; does anyone know if I would have to modify my contract or if the mobile internet would just convert to whatever the iPhone uses ? Will I have to pay extra?

Thank you :)
 
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